iUNIK Beta-Glucan Power Moisture Serum Review (2026)

By Margaret Wojewoda, Founder & Editor Last updated June 28, 2026

iUNIK Beta-Glucan Power Moisture Serum is one of the best minimalist hydrating serums in K-beauty — a short, fragrance-free, fungal-acne-safe formula built around a high dose of beta-glucan that delivers deep, soothing moisture for dry and sensitive skin. Treat it as a hydration-and-comfort layer, not a firming treatment, and it’s an easy, affordable win.

Last verified: June 2026. Formulas change — we re-check periodically against the current INCI.

Best Beta-Glucan Serum

iUNIK

iUNIK Beta Glucan Power Moisture Serum

beta-glucanpanthenolsodium hyaluronate

$$$ Budget-friendly

Link coming soon

Is it worth it? (the short answer)

For dry, dehydrated or sensitive skin, yes — it does one thing very well: deep, lightweight hydration with a soothing, barrier-supportive feel, at a low price.

• Buy it if your skin is dry, dehydrated, sensitive or fungal-acne-prone, or you like short ingredient lists.
• Skip it if you want a rich moisturizer (this is a layer), or you expect a one-bottle firming/anti-wrinkle fix.

What it is and how it works

The serum is built on beta-glucan — a humectant from yeast/mushrooms that draws water into skin, soothes, and supports the barrier. iUNIK uses a high concentration (listed around 160,000 ppb) in a deliberately short list: glycerin and sodium PCA (more humectants), adenosine (a soothing, anti-aging-adjacent active), and little else. Around ten ingredients total, no fragrance.

Beta-glucan is often described as holding moisture even better than hyaluronic acid, and lab work points to repair, antioxidant and collagen-supportive potential. Be honest about the evidence, though: much of the anti-aging data is preclinical (in-vitro or animal), so the dependable, here-and-now benefit is deep hydration and soothing — not a proven wrinkle treatment.

What it is not: a moisturizer. It hydrates but doesn’t seal, so it needs a cream on top.

Formulation and flags

What the internet really says

iUNIK’s beta-glucan serum has a quiet cult following, especially among dry and sensitive-skin users who want a no-drama hydrator. The consistent praise: deep, lasting hydration from a tiny ingredient list, a comfortable non-greasy finish, and reliability for reactive skin.

The honest negatives:

• It’s a layer, not a moisturizer. People expecting a rich cream are underwhelmed — seal it.
• Subtle if you’re already hydrated. Like any humectant, the effect is biggest on parched skin.
• Pilling. The carbomer can ball up in thick layers or under some sunscreens.
• Manage anti-aging expectations. Beta-glucan’s firming claims are promising but not clinically nailed down topically.

Our read: as a gentle, affordable hydration step — especially for fungal-acne-prone skin that struggles to find safe products — it’s a standout. (User reports, not guarantees — your skin may differ.)

Who it’s for, by skin type

How to use it (and where it fits)

Apply after cleansing and toner, on slightly damp skin, before your moisturizer. Thin layers, let it absorb, then seal with a cream — beta-glucan hydrates but doesn’t lock moisture in alone. Works morning and night.

See the fragrance-free Korean routine for the full order of steps, and pair it under a ceramide barrier cream for compromised skin.

Alternatives and comparisons

• Prefer pure hyaluronic hydration? The Ordinary Hyaluronic Acid 2% + B5.
• Want beta-glucan in a toner? Klairs Supple Preparation Unscented Toner blends beta-glucan, HA and centella.
• Want soothing snail hydration instead? COSRX Snail 96 Essence.
• Full match-up: Beta-Glucan vs Hyaluronic Acid · Glass-skin hydration picks

Price and where to buy

Affordable and widely stocked (YesStyle, Amazon). Prices and availability vary by country — the button below routes you to the best option for your region. (We’ll add restock and price-drop alerts here later.)

Best Beta-Glucan Serum

iUNIK

iUNIK Beta Glucan Power Moisture Serum

beta-glucanpanthenolsodium hyaluronate

$$$ Budget-friendly

Link coming soon

FAQ

Is iUNIK Beta-Glucan serum worth it?

For dry, dehydrated or sensitive skin — yes. It’s a cheap, minimalist, fragrance-free serum that delivers deep, soothing hydration and is fungal-acne-safe. It’s a hydration step, not a firming treatment, and you still need a moisturizer on top.

What does beta-glucan do for skin?

Beta-glucan is a humectant that draws in water and soothes; it’s often cited as holding moisture even better than hyaluronic acid, and shows repair and antioxidant potential. Much of the anti-aging evidence is preclinical, so treat it as a strong hydrator-and-soother.

Is iUNIK Beta-Glucan serum fungal-acne safe?

Yes — the formula is free of the oils, esters and fatty alcohols that feed Malassezia, and is commonly listed as fungal-acne-safe. As always, patch-test if you’re highly reactive.

Beta-glucan or hyaluronic acid — which is better?

They overlap as humectants; beta-glucan adds soothing and barrier-supportive properties and tends to hold moisture a little better, while HA is pure, lightweight hydration. Many routines use both — see our beta-glucan vs hyaluronic acid comparison.

How do you use iUNIK Beta-Glucan serum?

After cleansing and toner, on damp skin, before your moisturizer. Use thin layers, let it absorb, then seal with a cream. Use morning and night as a hydration step.

Reviewed by Margaret Wojewoda. How we evaluate products: see our methodology. Sources appear below and include independent ingredient analysis.

Related

• Beta-Glucan vs Hyaluronic Acid: Which for a Damaged Barrier?
• Best K-Beauty Barrier Repair Creams for Sensitive Skin
• The Fragrance-Free Korean Skincare Routine for Sensitive Skin